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Question: A cat sits next to a typewriter whose only keys are the letters A-Z. The...

Question: A cat sits next to a typewriter whose only keys are the letters A-Z. The cat bats one of the keys at random. Then she does it again. What's the probability the cat has typed "AB"?

Notes: We are not allowed to use the combination formula and must explain using only factorials

math   Statistics-And-Probability   
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